"Japan's IKAROS spacecraft has already successfully deployed the first solar sail in space, but today it made the only first that really matters: it successfully captured the sun's rays with its 278.709 square meter-sail and used the energy to speed its way through space. Each photon of light exerts 0.090718474 grams of pressure on the 278.709 square meter-sail, and the steady stream of solar exposure has succeeded in propelling the nearly 317.514659 kilogram-drone."